Abstract
Summary Investigations into girdling root formation in young landscape trees revealed that Norway and sugar maples had an average of four girdling roots per tree and that red maple had nearly twice as many. While these roots persisted to become a serious problem in older Norway maples, they did not in red and sugar maples. Removing the roots was ineffective since new girdling roots were regenerated from the same location. Of the 60 mature Norway maple examined girdling and potentially girdling roots were completely absent on only two trees. Genetic diversity may allow a rootstock to be selected and propagated so as to reduce or eliminate the character of girdling roots.
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